Physics Lab Equipment

LEAI-11A Experimental System of CW NMR - Advanced Model

LEAI-11A Experimental System of CW NMR - Advanced Model

Note: oscilloscope not included 


  • 11 easy-to-use specimens in micropipette tubes

  • Highly homogeneous magnetic field to assure more coda waves

  • Open magnet structure for easy specimen access

  • High SNR & stable frequency

  • One specimen contains both H & F nuclei for determining the g-factor of F-nuclei

  • High accuracy milli-teslameter and frequency meter included


This LEAI-11A experimental system of continuous-wave nuclear magnetic resonance (CW-NMR) consists of a high homogeneity magnet and a controller unit. The marginal oscillator is separated from the electric unit and mounted on a scaled rail. It can be conveniently adjusted and precisely positioned in the magnetic field. It is an ideal experimental instrument for advanced physics laboratories.

The instruction manual contains comprehensive materials including experimental configurations, principles and step-by-step instructions. Please click Experiment Theory and Contents to find more information about this apparatus.

Using this instrument, the following experiments can be performed:


1. Observe NMR phenomenon of H- and F-nuclei.

2. Determine parameters of gyromagnetic ratio, g-factor and nuclear magnetic moment.

3. Observe the influence of magnetic field homogeneity on signal coda wave using different specimens.

4. Measure magnetic field, and learn how to calibrate Teslameter through NMR method.


Types of nucleiH and F
SNR> 40 dB (H nucleus)
Oscillator frequency17 MHz to 23 MHz, continuously adjustable
Magnet polediameter: 100 mm; spacing: 20 mm
Power source of sweep field
0 ~ 5 V, 50/60 Hz
NMR signal amplitude (peak to peak)> 4 V (H-nuclei); > 100 mV (F-nuclei)
Homogeneity of magnetic fieldbetter than 8 ppm
Probe moving range5 ~ 15 cm
Phase shifter50 Hz sine wave, > 90°
Number of coda waves> 10 (H nucleus)
Teslametermeasurement range 0 ~ 2000.0 mT, resolution 0.1 mT

Parts List

Main Electric Unit1
Electromagnet with Rail & Marginal Oscillator1
Power Cord1
BNC Cable3
Connection Wires 
Tesla Probe1

Specimens in Micropipette Tubes

11 (CuSOSolution, CuSO4(1%, 2%, 3%, 4% & 5%), Fe2Cl3 Solution, HF Acid, Glycerol, Pure Water, Polytetrafluoroethylene) 
Frequency Meter1
Instructional Manual1


LEAI-11 Experimental System of nuclear magnetic resonance.png

NMR signal observed on oscilloscope (H-nuclei)

Experimental System of CW NMR.png

Lissajous figure


Block diagram of controller Circuit

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